_________ a certain doubt among the people as to the practical value of the project．
| A．It has | B．It remains | C．They have | D．There remains |
The policeman warned us ___________ believe such liars again.
| A．not | B．don’t |
| C．didn’t | D．not to |
I am sure that if you _____________ your time, you’ll achieve greater success.
| A．make full use o | B．take use of |
| C．use up | D．are used to |
He got home late ____________ the traffic was heavy.
| A．because that | B．because |
| C．because of | D．in order that |
I think it was his attitude ___________ annoyed the teacher.
| A．which | B．what |
| C．that | D．to which |
I must say your food is excellent but your service really needs __________.
| A．to improve | B．improved |
| C．being improved | D．improving |